Russian cyclist Alexandr Kolobnev has been sacked by his Katusha team following a failed doping test at the Tour de France.
Kolobnev has become the first rider to fail a drugs test on this year's event.
International Cycling Union (UCI) said on Monday that a urine sample provided by Kolobnev on 6 July contained traces of hydrochlorothiazide.
Hydrochlorothiazide, often used in the treatment of hypertension and congestive heart failure, removes excess fluid from the body and reduces urine output.